<template>
  <div class="batch-action-bar">
    <el-checkbox v-model="checkAll" :indeterminate="isIndeterminate" :disabled="!data.length">当页全选</el-checkbox>
    <div v-if="selectionData.length" class="tips">已选 {{ selectionData.length }} 项</div>
    <el-form :disabled="!selectionData.length">
      <slot />
    </el-form>
  </div>
</template>

<script>
export default {
  name: 'BatchActionBar',
  props: {
    data: {
      type: Array,
      default: () => []
    },
    selectionData: {
      type: Array,
      default: () => []
    }
  },
  data() {
    return {}
  },
  computed: {
    checkAll: {
      get: function() {
        let flag = false
        if (this.data.length != 0 && this.data.length == this.selectionData.length) {
          flag = true
        }
        return flag
      },
      set: function(newVal) {
        newVal ? this.$emit('check-all') : this.$emit('check-null')
      }
    },
    isIndeterminate() {
      let flag = false
      if (this.selectionData.length > 0 && this.selectionData.length < this.data.length) {
        flag = true
      }
      return flag
    }
  },
  created() {},
  mounted() {},
  methods: {}
}
</script>

<style lang="scss" scoped>
.batch-action-bar {
    display: flex;
    align-items: center;
    margin: 20px 0;
    padding: 0 10px;
    &:first-child {
        margin-top: 0;
    }
    .el-checkbox {
        margin-right: 20px;
    }
    .tips {
        margin-right: 20px;
        color: #909399;
        font-size: 13px;
    }
    ::v-deep .el-form {
        > .el-button {
            margin-right: 10px;
        }
        > .el-button-group {
            margin-right: 10px;
        }
    }
}
</style>
